Yoy or YOY may refer to:
- Yoy people
- Yoy language
- YOY, an abbreviation for year-over-year or year-on-year, meaning "in comparison with the same period last year."
Usage examples of "yoy".
At first I could not understand this trick of his, but soon I observed that he only did it when a peculiar noise--“yoy, yoy, yoy”--came from somewhere among the oak woods beneath us.